Which of the following is an example of a social norm in mainstream U.S.culture?

Name: Which of the following is an example of a social norm in mainstream U.S.culture?
Brand: Quizplus
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Question

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Using your turn signal to indicate which direction you will be turning is a social norm in mainstream U.S. culture. It is an expected behavior that helps maintain safety and order on the roads. A and D are not social norms in mainstream U.S. culture, while C is a common activity but not necessarily a social norm.

Which of the Following Is an Example of a Social